A year ago today, the FBI suddenly shut down a remote mountaintop observatory with no explanation. The internet went wild with theories.

She was imprisoned for murdering her husband, then escaped and assumed a new identity. Her adoring friends and employers had no idea.

Trapper Nelson was a Florida legend from the day he hopped off a boxcar to the day he died. But did he really kill himself, or was he murdered?

Eighty years ago today, a four-year-old girl vanished into the Pennsylvania woods. The search captivated people across the nation — and some have never stopped looking.

Children’s TV star Ricardo Medina claims the horrific stabbing was in self-defense; the victim’s family says it was murder. Here’s the inside story.

Ray Dolin was hiking across the U.S. when he was attacked and nearly died. Or that's what he said. His story quickly unraveled, but his real truth has never been told until now.

In rural North Carolina, a Native American activist who investigated police involvement in the cocaine trade turned up dead. Will anyone help me find out why?

The mysterious case of the first female U.S. District Attorney, and the morbid murder investigation that put her on the map.

On spring break in 2006, an Ohio State med student vanished into thin air. A decade later, his friends and family are still aching for answers.